EP0437882B1 - Videosystem - Google Patents

Videosystem Download PDF

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Publication number
EP0437882B1
EP0437882B1 EP90203394A EP90203394A EP0437882B1 EP 0437882 B1 EP0437882 B1 EP 0437882B1 EP 90203394 A EP90203394 A EP 90203394A EP 90203394 A EP90203394 A EP 90203394A EP 0437882 B1 EP0437882 B1 EP 0437882B1
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Prior art keywords
video signal
signal
video
detector
control signal
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EP90203394A
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English (en)
French (fr)
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EP0437882A1 (de
Inventor
Richard Cees Spiero
Theodorus Hendrik Christiaan Van Groningen
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
Philips Electronics NV
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/641—Multi-purpose receivers, e.g. for auxiliary information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/642—Multi-standard receivers

Definitions

  • the invention relates to a video system comprising a video signal generating device and at least one video signal receiving device and a signal bus, the video signal generating device having a video signal output for producing a video signal and the video signal receiving device having a video signal input for receiving the video signal, whilst the video signal input can be coupled to the video signal output of the video signal generating device over the signal bus.
  • the invention likewise relates to a video signal generating device and a video signal receiving device to be used in the video system.
  • a video system of the type set forth in the preamble is known, for example, from Funk-Technik 38 (1983), Vol. 5, pp. 208-212.
  • the video signal generating device can be a video tuner and the video signal receiving device can then be a television picture screen on which the video signal produced by the tuner can be displayed, or a video recorder on which the video signal produced by the tuner can be recorded.
  • the video recorder is the video signal generating device.
  • the signal reproduced by the video recorder can now be applied over the signal bus to the television screen for visualizing the video signal.
  • the system may optionally include one or a plurality of receiving devices.
  • the system may optionally include one or a plurality of video signal generating devices.
  • the invention describes the cooperation of a video signal generating device with one or a plurality of video signal receiving device. These devices can be coupled to each other over a signal bus, for example, the SCART bus as described in aforementioned publication.
  • the video system according to the invention is characterised in that the video signal generating device is capable of generating a video signal according to a number of x video signal formats from a number of y video signal formats, in that the video signal receiving device is suitable for receiving and processing a video signal according to a number of z video signal formats from the number of y video signal formats, in that for y it holds that y > 1, and for x and z it holds that 1 ⁇ x ⁇ y and 1 ⁇ z ⁇ y, in that the video signal generating device comprises a control signal generator for generating a first control signal for each of the x video signal formats and/or for generating a second control signal for each of the y-x remaining video signal formats and for delivering the x first and/or y-x second control signals at a control signal output of the video signal generating device, in that the video signal receiving device comprises a control signal generator for generating the first control signal for each of the z video signal formats and/or for generating the
  • Future video signal generating devices will be able more and more often to generate video signals according to more than one video signal format.
  • video signal formats one may think of, for example, the CVBS (chroma-video-blanking-sync) signal, that is to say, a signal comprising both the chrominance and the luminance component of the video signal in a combined form; the Y/C signal, in which the chrominance and luminance components are presented separately; the Y-U-V or the R-G-B signal; or the MAC signal.
  • CVBS chroma-video-blanking-sync
  • a signal comprising both the chrominance and the luminance component of the video signal in a combined form
  • the Y/C signal in which the chrominance and luminance components are presented separately
  • the Y-U-V or the R-G-B signal or the MAC signal.
  • future video signal receiving devices will be able more often to process video signals according to more than one video signal format.
  • the system Since the various devices are able to indicate by means of the control signals which video signal formats they can handle and/or which video signal formats they cannot handle, the system is able to make a choice.
  • the system thereto chooses a video signal format held in common at any rate by the devices then activated.
  • the detector unit can establish that at least two video signal formats are common to the activated devices. In that case one video signal format is to be selected by the detector unit. For example, if there are two common video signal formats of which one for-at has a greater video signal quality (for example MAC) than the other format (for example CVBS), the detector unit can detect the video signal format having the higher video signal quality (MAC). If the devices have two equivalent video signal formats in common, for example YU-V and R-G-B, the detector unit can be predetermined to select, for example, the Y-U-V format.
  • MAC video signal quality
  • the detector unit can be predetermined to select, for example, the Y-U-V format.
  • a single detector unit included in one of the devices will suffice.
  • the output of the detector unit is coupled to a detector signal output of this device and the other device(s) has (have each) a detector signal input which may be coupled over the signal bus to the detector signal output of said one device.
  • the control signal outputs of the devices have each y sub-outputs, whilst each of the y control signal sub-outputs of a device corresponds to one of the y video signal formats, in that each of the y control signal sub-outputs of a device can be coupled to a corresponding sub-output of the y control signal sub-outputs of the other devices over an associated signal line in the signal bus, and in that the control signal generator in a device has y outputs, each of the y outputs being coupled to an associated control signal sub-output of the device, in that the control signal generator in the video signal generating device is arranged for producing the first control signal at the x outputs corresponding to the x video signal formats and/or for producing the second control signal at the y-x remaining outputs, and in that the control signal generator in the video signal generating device is arranged for producing the first control signal at the z outputs corresponding to the z video signal formats and/or for producing the second control signal at the y-z remaining output
  • control signal generator in the video signal generating device is arranged for serially generating in a specific fixed order for the y video signal formats the x first control signals for each of the x video signal formats and/or for serially generating the y-x second control signals for each of the y-x remaining video signal formats, in that the control signal generator in the video signal receiving device is arranged for serially generating in the saame order for the y video signal formats the z first control signals for each of the z video signal formats and/or for serially generating the y-z second control signals for each of the yz remaining video signal formats, and in that an output of a control signal generator is coupled to the control signal output of the associated device.
  • each device could be sufficient to allow each device to generate a first control signal for those video signal formats for which the device itself can suitably be used. Another possibility is to allow the device to generate only a second control signal for those signal formats for which the device cannot suitably be used.
  • the devices can generate both the first and the second control signals.
  • the video signal generating device generates both the first and the second control signals for those video signal formats for which this generating device is suitable or unsuitable respectively.
  • the receiving devices can then generate, for example, only the second control signals. If these second control signals are dominant (that is to say, if a first control signal is applied by a first device and a second control signal is applied by a second device to one and the same line in the signal bus, the second control signal will appear on this line) it will only be necessary to detect for which video signal formats a first auxiliary signal is still present on the line.
  • Fig. 1 shows a video system comprising a video signal generating device 1, a video signal receiving device 2, a video signal receiving device 3 and a signal bus 4.
  • the video signal generating device 1 is arranged for generating a video signal according to the CVBS format, a video signal according to the Y/C format and a video signal according to the MAC baseband format.
  • the MAC baseband format is described, for example, in Funkschau 18/1985, pp. 59-63, more specifically, Fig. 1.
  • the video signals are derived (may be derived) from the same picture signal so that in fact the same video signal is concerned which can be generated in the three formats described.
  • a video signal according to the Y/C format is concerned, it is a matter of two separate signals, that is to say, the luminance signal y and the chrominance signal C. These signals are in fact to be transported over two separate lines.
  • the video signal generating device comprises three video signal sources 5, 6 and 7 for generating the video signals according to the above three formats CVBS, Y/C and MAC baseband respectively. Outputs of these sources are coupled to associated terminals 8, 9 and 10 respectively, of controllable switching means in the form of a three-state switch 12. A terminal 11 of this switch 12 is coupled to the video signal output 13 of the device 1. Since the signal source 6 ought to have two outputs, the switch 12 actually ought to look differently and video signal output 13 of device 1 actually ought to be constituted by two outputs. However, the diagrammatic representation as shown in Fig. 1 will suffice for the explanation.
  • the device 1 comprises a control signal generator 14 having four outputs coupled to four sub-outputs 15.1, 15.2, 15.3 and 15.4 of a control signal output 15 of the device 1.
  • Device 2 comprises three video signal processing units 16, 17 and 18 arranged for processing a video signal according to the following respective formats: CVBS, Y/C and RGB.
  • the inputs to the units 16, 17 and 18 are coupled to the terminals 19, 20 and 21 respectively, of controllable switching means constituted by a three-state switch 22.
  • the terminal 23 of this switch 22 is coupled to the video signal input 24 of the device 2.
  • the device 2 comprises a control signal generator 25 whose four outputs are coupled to sub-outputs 26.1, 26.2, 26.3 and 26.4 of a control signal output 26.
  • the unit 17 actually has two inputs for receiving the two components Y and C and the unit 18 has three inputs for receiving the three colour components red, green and blue.
  • the three-state switch 22 therefore shows only diagrammatically the operation of the device. However, this will be sufficient for a proper understanding.
  • Device 3 comprises two video signal processing units 27 and 28 for processing a CVBS or a MAC baseband signal respectively.
  • the inputs to these units 27 and 28 are coupled to terminals 29 and 30 respectively, of controllable switching means constituted by a two-state switch 31.
  • One terminal 32 of this switch 31 is coupled to the video signal input 33 of device 3.
  • a control signal generator 34 again has four outputs coupled to sub-outputs 35.1, 35.2, 35.3 and 35.4 of a control signal output 35 of device 3.
  • the video system further includes a detector unit 36 shared by the entire system, but included in device 1.
  • the detector unit 36 has four inputs 37.1, 37.2, 37.3 and 37.4 coupled to the control signal sub-outputs 15.1 to 15.4, and has an output 38. This output is coupled to the control signal input of switch 12 and to detector signal output 39 of device 1.
  • the devices 2 and 3 have each a detector signal input 40 or 41 respectively.
  • the detector signal input 40 is coupled to a control signal input of switch 22 and the detector signal input 41 is coupled to a control signal input of switch 31.
  • the signal bus 4 comprises four lines for conveying the control signals between the various devices.
  • the terminals 15.1, 26.1 and 35.1 are coupled to each other over line 42.1. So are the terminals 15.2, 26.2 and 35.2 through line 42.2.
  • the terminals 15.3, 26.3 and 35.3 are coupled to each other over line 42.3 and terminals 15.4, 26.4 and 35.4 are coupled to each other over line 42.4.
  • the detector signal of the detector 36 presented at output 39 is applied to the detector signal inputs 40 and 41 of the respective devices 2 and 3 over line 42.5 in the signal bus 4.
  • the video signal output 13 of device 1 is coupled to the video signal inputs 24 and 33 of the devices 2 and 3 over line 42.6 in the signal bus 4.
  • the aforementioned may have distinctly shown that the line 42.6 in fact is to comprise no less than three separate signal conductors for transmitting the RGB signal. If a Y/C video signal is transmitted, two of these three signal conductors can be used and if the transmitted video signal is a CVBS or a MAC baseband signal no more than one of the three signal lines is used. If the SCART cable known per se were used for a signal bus, the distribution of the various video signal components over the various lines in the SCART cable would be different.
  • the SCART cable comprises three separate lines for the three colour components red, green and blue.
  • the SCART cable further includes a separate line for the CVBS video signal.
  • a Y/C video signal is transmitted through a SCART cable, the Y component will be conveyed over the CVBS line and the C component over one of the three lines for the RGB signal.
  • the control signal generator 14 delivers at the outputs 43.1, 43.2 and 43.4 a first control signal in the form of a voltage of V volts.
  • V is unequal to O and has a value of, for example, 10 volts.
  • the voltage of V volts at the output 43.1 denotes that the device 1 is able to generate a CVBS video signal.
  • the voltage of V volts at the output 43.2 denotes that the device 1 is able to generate a video signal according to the Y/C format.
  • the voltage of V volts at the output 43.4 denotes that the device 1 is able to generate a MAC baseband signal.
  • the output 43.3 in the generator 14 is connected to earth. This means that there is a second control signal in the form of a zero voltage at the output 43.3 which means that the device 1 is unable to generate a RGB video signal.
  • the control signal generator 25 delivers a first control signal in the form of a voltage of V volts at the outputs 44.1, 44.2 and 44.3, which denotes that the device is able to process a video signal according to the CVBS, Y/C and RGB formats. The device is unable to process a MAC baseband signal. Therefore, the generator 25 produces a zero voltage at the output 44.4.
  • the outputs 45.1 and 45.4 carry a voltage of V volts and the outputs 45.2 and 45.3 a zero voltage. Due to the zero voltage at the output 44.4, a zero voltage will also occur on the line 42.4 in the signal bus 4. A zero voltage will also occur on the lines 42.2 and 42.3 in the signal bus due to the zero voltage on the outputs 45.2 and 45.3. Only line 42.1 will carry a voltage of V volts.
  • the detector 36 detects that there is a high voltage only on input 37.1. Thus, the detector 36 knows that the three devices have the CVBS video signal format in co-mon.
  • the detector 36 produces at its output 38 a detector signal so that in response to this detector signal switch 12 switches to the state in which terminals 8 and 11 are coupled to each other.
  • this detector signal is also applied to the switches 22 and 31 in the devices 2 and 3 over line 42.5 in the signal bus 4, this detector signal also provides that the switch 22 is moved to the state in which the terminals 19 and 23 are coupled to each other and provides that switch 31 is moved to the state in which terminals 29 and 31 are coupled to each other.
  • a CVBS video signal is now presented at output 13 by the device 1 and applied to the inputs 24 and 33 of the respective devices 2 and 3 over line 42.6 in the signal bus 4.
  • the video signal is applied to the CVBS video signal processing units 16 and 27 respectively, in which the CVBS video signal can be processed.
  • the device 2 may be a video recorder in which the video signal is recorded on a magnetic record carrier.
  • the device 3 may be a picture screen on which the video signal is displayed as a picture signal.
  • the device 3 is switched off. Switching off this device means that the outputs 45.1 to 45.4 of the control signal generator 34 become non-earthed. This means that these outputs are disconnected from the +V voltage and from earth when the switches (not shown) in the control signal generator 34 are opened. Consequently, the two lines 42.1 and 42.2 reach a voltage of +V volts.
  • the detector 36 now detects that the devices 1 and 2 have the video signal formats CVBS and YIC in common.
  • the detector 36 may now choose the format having the higher picture quality, which in this case is the Y/C format. Thereupon the detector 36 produces a detector signal so that the switch 12 is moved to the state in which terminals 9 and 11 are coupled to each other and switch 22 is moved to a state in which terminals 20 and 23 are coupled to each other.
  • the device 2 was a video recorder and device 3 a picture screen and that a CVBS video signal is generated by the device 1 and simultaneously recorded on a video recorder and visualized on the picture screen.
  • Switching off the device 3 means a change-over to the YIC video signal. This change-over may result in disturbances in the recording of the video signal on the video recorder.
  • the detector 36 may comprise a "quality lock not-up" option which may be switched on by the user. Such an option means that when, for example, device 3 is switched off, which may lead to changing to a different video signal format, i.e. a video signal format having a higher picture quality, this change is counteracted.
  • this does have the disadvantage of recording the video signal on the video recorder with a low picture quality although a higher picture quality is feasible.
  • Fig. 2 shows a second exemplary embodiment of the video system.
  • the video system again comprises three devices: a video signal generating device 1′, and two video signal receiving device 2′ and 3′, and furthermore a signal bus 4′.
  • the device 1′ in Fig. 2 shows much similarity to the device 1 shown in Fig. 1.
  • the control signal generator 14′ now has a different structure and has a single output 43′ coupled to the control signal output 15′ also in the form of a single output.
  • the detector 36′ has and input 37′ coupled to the output 15′.
  • the device 2′ shows much similarity to the device 2 shown in Fig. 1.
  • the control signal generator 25′ here too has a different structure and has a single output 44′ coupled to the (single) control signal output 26′.
  • the device 2′ furthermore comprises a detector 50 operating in exactly the same manner as detector 36′.
  • the device 3′ comprises a signal processor 28 for processing a MAC baseband signal, a processor 56 for processing a Y/C video signal, a control signal generator 34′ having a single output 45′ coupled to the single control signal output 35′, and a detector 53 operating in the same fashion as the detector 36′.
  • the control signal generator 14′ is arranged for serially generating the control signals. This is visualized in Fig. 3a.
  • the generator 14′ recurrently generates a signal pattern as shown in Fig. 3a.
  • First the generator 14′ generates a start signal. This start signal is a signal change from 0 to V volts at the instant t0. In the time interval (t0, t1) this start signal remains "high” (+V volts).
  • the generator 14′ generates an acknowledge-request signal in the time interval (t1, t2). This acknowledge-request signal is a "high” signal (+V volts).
  • generator 14′ generates a first control signal (+V volts) in the time interval (t2, t3).
  • the device 11 can generate a CVBS video signal.
  • the generator 14′ In the time interval (t3, t4) the generator 14′ generates again the first control signal (+V volts): the device 1′ is able to produce a Y/C video signal.
  • the generator 14′ In the time interval (t4, t5) the generator 14′ generates a second control signal by way of a "low" signal (0 volts): the device 1′ cannot produce a RGB signal.
  • the generator 14′ In the time interval (t5, t6) the generator 14′ generates a first control signal (+V volts) which corresponds to the fact that the device 11 is able to produce a MAC baseband signal.
  • the signal becomes "low” (0 volts) and remains so until the generator 14′ again generates the signal sequence as represented in Fig. 3a.
  • the generator 25′ in the device 2′ detects at instant t0 the start signal as applied by the generator 14′ to the line 4a in the signal bus 4′.
  • the generator 25′ Once the generator 25′ has recognized the start signal the generator 25′ generates a "low” signal (0 volts) as an acknowledge signal at its output 44′ in the acknowledge-request time interval (t1, t2), cf. Fig. 3b. The purpose of this signal will be explained hereinbelow. In the time intervals (t2, t3), (t3, t4), (t4, t5) and (t5, t6) the generator 25′ then generates at its output 44′ a "high” signal again a "high” signal another "high” signal and a "low” signal.
  • the device can process the CVBSI YIC and RGB signals but cannot process the MAC baseband signal.
  • the generator 34′ detects the start signal at instant t0 and produces a "low” signal for an "acknowledge signal” in the "acknowledge-request” time interval (t1, t,), see Fig. 3c.
  • the generator 34′ then produces a "low” signal a "high” signal a "low” signal and yet another "high” signal.
  • the ultimate signal on line 4a is represented in Fig. 3d. Since the "low” second auxiliary signal having 0 volts is dominant the signal on line 4a will become “low” (0 volts) for a certain time interval if one of the devices generates a second auxiliary signal in this time interval.
  • the signal on line 4a is "low” for the time intervals (t1, t2), (t2, t3), (t4, t5) and (t5, t6). Only for the time interval (t3, t4) the signal is "high” (+V volts).
  • the detectors 36′, 50 and 53 all detect that only in the time interval (t3, t4) the signal on line 4a is “high”. This means that all devices have the Y/C signal format in common.
  • the detectors 36′, 50, 53 present each a detector signal at their respective outputs 38, 52 and 55 so that the switches 12, 22 and 31 assume the states represented in Fig. 2.
  • the start signal generated by the device 1′ in the time interval (t0, t1) has for its aim to start the timing in the devices 2′ and 3′ so that all devices generate in the same time interval exactly coinciding first or second control signals depending on whether or not a device is suitable for generating or processing the video signal format concerned.
  • the device 1′ In the time interval (t1, t2) in which the device 1′ generates the acknowledge-request signal (+V volts) and hence establishes the "acknowledge-request” interval the other devices 2′ and 3′ generate an "acknowledge signal” which is "low".
  • the device 1′ can thus detect whether a "low” signal (0 volts) is carried on line 4a in the time interval (t1, t2). This detection could be performed in the control signal generator 14′ itself. If a "low” signal is detected on line 4a in the time interval (t1, t2), the device 1′ knows that there are devices 2′ and 3′ connected to the signal bus which are suitable for generating the control signals for establishing the video signal format common to all devices.
  • the signal bus 4′ which do not comprise a control signal generator such as the generators 24′ and 35′, one may consider in this respect the video recorders and picture screens already available in the households the signal on line 4a will remain "high” in the time interval (t1, t2) in which the control signal generating device 14′ generates the "acknowledge-request" signal.
  • the device 1′ is then notified that no further devices are connected to the signal bus 4′ which are suitable for cooperation with the device 1′ over line 4a for establishing a common video signal format. In that case the device 1′ automatically changes to the lowest video signal quality.
  • the detector 36′ generates a detector signal in response to which the switch 12 is moved to a state in which terminal 8 is connected to terminal 11.
  • the device 1′ then produces a CVBS signal at the output 13.
  • the device 2′ is now switched off. This means that in the time intervals (t3, t4) and (t5, t6) the control signal on line 4a is "high". In this case the detectors 36′ and 53 will move the switches 12 and 31 to the states in which the terminals 10 and 11 are coupled together and the terminals 30 and 32 are coupled together.
  • the video system shown in Fig. 2 may have the "quality lock not-up” and/or the “quality lock not-down” option which may be switched on by the system user.
  • Fig. 4 diagrammatically shows an exemplary embodiment of the control signal generator 14′ in the device 1′ of Fig. 2.
  • the generator 14′ in Fig. 4 comprises a controller 60 applying switching signals to switches 61 and 62 and an enable signal to an "acknowledge signal" detector 63.
  • the switching signal is generated once again so that the switch 61 opens and switch 62 closes.
  • the controller 60 additionally generates an enable signal on line 66.
  • the "acknowledge signal” detector 63 is activated for detecting in the time interval (t1, t2) whether the signal on line 4a, that is the signal at the output 43′, becomes “low” due to the presence of the devices 2, and 3′. If this "low" control signal is detected by the detector 63, it will apply a detection signal to the controller 60 over the line 67. In response to this detection signal the controller 60 continues generating the switching signals for the switches 61 and 62.
  • the controller 60 will stop generating the switching signals.
  • the controller 60 will then generate over line 68 a control signal which will be applied to the detector 36′.
  • the detector 36′ will then generate a detector signal so that the switch 12 assumes the state in which the terminals 8 and 11 are coupled to each other.
  • FIG. 9a Two further possible exemplary embodiments of the control signal generator 14′ in the device 1′ are represented in the Figs. 9a and 9b. These exemplary embodiments show much similarity to the control signal generator shown in Fig. 4. The differences are that in the exemplary embodiment represented in Fig. 9a the switch 62 is replaced with an impedance by way of a high-ohmic resistor 62′. The controller 60 does not need to generate the switching signals for the switch 62 in Fig. 4. The switching signals applied to switch 61 over line 64 are the same as those of Fig. 4.
  • the switch 61 is replaced with an electrical interconnection.
  • the controller 60 does not need to generate the switching signals for the switch 61 in Fig. 4.
  • the switching signals applied to switch 62 over line 65 are the same as those of Fig. 4.
  • Fig. 5 shows an exemplary embodiment of the control signal generator in the devices 2′ or 3′ in Fig. 2.
  • the control signal generator shown in Fig. 5 represents a controller 70, a start signal detector 71 and a controllable switch 72.
  • the start signal detector 71 detects the start signal generated by the control signal generator 14′ of the device 1′ in the time interval (t0, t1).
  • the detector 71 then generates a detection signal to be applied to the controller 70 over the line 73.
  • the controller 70 then generates a switching signal to be applied to the control signal input of switch 72 over the line 74.
  • the switch 72 then closes during the time interval (t1, t2). Hence, output 75 of the control signal generator becomes "low” (the "acknowledge signal").
  • Fig. 6 shows by way of a Table the operation of the detector 36′ shown in Fig. 2.
  • the left part of the Table shows any combination of first and second control signals for the four time intervals corresponding to the four signal formats, whilst the first control signal is denoted by a logic "1" and the second control signal by a logic "0".
  • the choice of the device 1′ on a certain video signal format is shown under the heading of "choice”. If no "acknowledge signal" is received, the device 1′ will change to the CVBS video signal as is shown on the bottom line of the Table.
  • the operation as shown in Fig. 6 also applies to the device 1 shown in Fig. 1. Therefore, the four columns also bear the reference numbers 37.1 to 37.4 for the inputs to the detector 36 shown in Fig. 1.
  • the Table shown in Fig. 7 clarifies the operation of device 2′ shown in Fig. 2 and the Table in Fig. 8 the operation of the device 3′ shown in Fig. 3.
  • the detector 50 is to know which of the two video signal formats, the Y/C or RGB formats, which have virtually equal quality, is to be chosen.
  • Fig. 10 shows a different exemplary embodiment of a video signal generating device 1 ⁇ in the form of a video tuner.
  • an aerial 70 video signals transmitted by various kinds of transmitters can be received.
  • transmitters for example, transmitting MAC video signals and transmitters transmitting PAL video signals.
  • Tuning the tuner to one transmitter or the other, by means of the tuning element 90, means that a MAC signal is received in one case and a PAL signal in the other.
  • the tuner comprises a video signal detector unit 71 which can detect whether the received signal present at the output 91 of the tuning element 90 originates from a MAC transmitter or a PAL transmitter. Depending on the detected signal the detector unit produces a control signal at an output 72. This control signal is applied to control signal inputs of controllable switches 73 and 74 and to an input 75 of the control signal generator 14 ⁇ .
  • tuner 1 ⁇ If tuner 1 ⁇ is tuned to a PAL transmitter, the detector unit 71 will generate a control signal in such a way that the switches 73 and 74 assume the state different from the one shown in the diagram.
  • the signal received through the aerial is thereby applied to the PAL processor 76 which renders the signal received from the aerial into a PAl video signal.
  • this generator In response to the control signal applied to the control signal generator 14 ⁇ by the detector unit 71 this generator generates at its output 77 a first control signal for PAL and/or a second control signal for MAC. Assuming that the video signal receiving device(s) connected to the video signal generating device 1 ⁇ can at least receive the PAL signal, the detector 36′ will present a detection signal at its output 38 so that the controllable switch 12′ assumes a state so that the output 78 of the PAL processor 76 is coupled to the video signal output 13.
  • the tuner 1 ⁇ is tuned to a MAC transmitter.
  • the detector unit 71 will generate a control signal in such a way that the switches 73 and 74 assume the states shown in the drawing Figure.
  • the signal received through the aerial is applied to the MAC processor 79 which renders the signal received through the aerial into a HAC video signal.
  • the tuner 1 ⁇ also comprises a MAC-PAL converter 81, the MAC video signal is available at the terminal 82 of switch 12′ and the PAL video signal is available at the terminal 83 of the switch 12′.
  • the generator 14 ⁇ will now generate a first control signal for both MAC and PAL.
  • the generator 14 ⁇ is capable of presenting various kinds of control signals at its output 77 depending on the tuning of the tuner 1 ⁇ to a transmitter.
  • the detector 36′ Depending on the connected video signal receiving device(s) the detector 36′ subsequently chooses the common video signal format: that is to say, MAC or PAL. In the former case the terminal 82 of switch 12′ and in the latter case the terminal 83 of this switch 12′ is connected to the output 13.
  • a different exemplary embodiment of a video signal generating device is a "transparent" video recorder.
  • a video recorder of this type is capable of recording PAL, MAC or different kinds of video signals unmodified on a magnetic tape and also capable of reproducing them.
  • a video recorder of this type will additionally comprise converters for converting the MAC signal, if reproduced, into a PAL or RGB signal depending on the functions of these converters.
  • the video recorder will generate first and/or second control signals from which it appears that the video recorder is capable of (solely) producing a PAL video signal.
  • the video recorder will generate first and/or second control signals from which it appears that the video recorder is capable of generating MAC, PAL and RG8 signals.
  • the control signals represented in Fig. 3 can be extended by still further information.
  • an additional time interval in the serial data stream of Fig. 3a can be reserved for indicating whether the video signal generating device is capable of generating a video signal having pictures with a 16 x 9 aspect ratio or only a video signal with the standard 4 x 3 aspect ratio.
  • a first control signal (“high” or +V volts)
  • a second control signal (“low” or 0 volts).
  • it is possible to reserve an additional time interval for indicating whether the audio signal belonging to the video signal is a mono signal or a stereo signal.
  • a first control signal (“high” or +V volts)
  • a second control signal (“low” or 0 volts) can be generated.
  • an additional time interval can be reserved for indicating whether the audio signal belonging to the video signal is for example bilingual or not.
  • the detectors 36′, 50 and 53 may further be arranged in such a way that a detector signal at the outputs 38, 52 and 53 will be arranged only after the same serial data stream of Fig. 3d recurrently present on the line has been detected a number of times, for example, five times. This may decrease the liability to disturbance. Since the signal on line 4a is "low" outside the time intervals (the time interval t0, t6 in Fig. 3) during which the control signals are recurrently transmitted, the system is compatible for future extensions of the number of possible video signal formats in the system.
  • Future devices could be capable of generating or processing in excess of four video signal formats, for example a fifth video signal format.
  • Such a new device will then produce in additional time interval t6, t7 (not shown in Fig. 3) a first control signal ("high") on the line 4a. Since the other devices in the system are not capable of generating or processing this fifth video signal, the signal on line 4a will still remain "low" during the time interval t6, t7.
  • the new device is thus capable of generating or processing the video signal according to the fifth format, this device will not operate in that mode. Only after all further devices in the system have meanwhile been replaced with devices that are capable of also handling the video signal according to the fifth format will it be possible for the video signal according to the fifth format to be conveyed between the various devices.

Claims (25)

  1. Videosystem mit einer Videosignalerzeugungsanordnung und wenigstens einer Videosignalempfangsanordnung und einem Signalbus, wobei die Videosignalerzeugungsanordnung einen Videosignalausgang zum Erzeugen eines Videosignals und die Videosignalempfangsanordnung einen Videosignaleingang zum Empfangen des Videosignals enthalten, während der Videosignaleingang mit dem Videosignalausgang der Videosignalerzeugungsanordnung über den Signalbus gekoppelt sein kann, dadurch gekennzeichnet, daß die Videosignalerzeugungsanordnung ein Videosignal entsprechend einer Anzahl von x Videosignalformaten aus einer Anzahl von y Videosignalformaten erzeugen kann, daß die Videosignalempfangsanordnung sich zum Empfangen und Bearbeiten eines Videosignals entsprechend einer Anzahl von z Videosignalformaten aus der Anzahl von y Videosignalformaten eignet, daß für y gilt, daß y > 1 ist, und daß für x und z gilt, daß 1 ≦ x ≦ y und 1 ≦ z ≦ y sind, daß die Videosignalerzeugungsanordnung einen Steuersignalgenerator zum Erzeugen eines ersten Steuersignals für jedes der X Videosignalformate und/oder zum Erzeugen eines zweiten Steuersignals für jedes der y-x restlichen Videosignalformate und zum Ausgeben der x ersten und/oder y-x zweiten Steuersignale an einem Steuersignalausgang der Videosignalerzeugungsanordnung enthält, daß die Videosignalempfangsanordnung einen Steuersignalgenerator zum Erzeugen des ersten Steuersignals für jedes der Z Videosignalformate und/oder zum Erzeugen des zweiten Steuersignals für jedes der y-z restlichen Videosignalformate und zum Erzeugen der z ersten und/oder y-z zweiten Steuersignale an einem Steuersignalausgang der Videosignalempfangsanordnung enthält, daß die Steuersignalausgänge der Videosignalerzeugungsanordnung und der Videosignalempfangsanordnung über den Signalbus miteinander gekoppelt werden können, daß das Videosystem eine Detektoreinheit enthält, die in Beantwortung der ersten und/oder zweiten Steuersignale zum Erstellen der gemeinsamen p Videosignalformate für die verschiedenen Anordnungen aus den y Videosignalformaten dient, daß die Detektoreinheit dazu mit einem Eingang an den Steuersignalausgang einer Anordnung gekoppelt ist und einen Ausgang zum Erzeugen eines kennzeichnenden Detektorsignals des gemeinsamen Videosignalformats bei p = 1 und zum Erzeugen eines Detektorsignals bei p ≧ 2, das kennzeichnend für eines der p gemeinsamen Videosignalformate ist, zum Zuführen des Detektorsignals an die Anordnungen enthält, daß die Videosignalerzeugungsanordnung zum Erzeugen eines Videosignals an ihrem Videosignalausgang entsprechend dem gemeinsamen Videosignal in der Erstellung von der Dektoreinheit in Beantwortung des Detektorsignals angeordnet ist, und daß die Videosignalempfangsanordnung zum Einstellen des Empfangsanordnung in Beantwortung des Detektorsignals angeordnet ist, so daß das Videosignal in der Empfangsanordnung entsprechend dem von der Detektoreinheit bestimmten Videosignalformat bearbeitet werden kann.
  2. Videosystem nach Anspruch 1, dadurch gekennzeichnet, daß die Detektoreinheit zum Erzeugen eines Detektorsignals bei p 2 ≧ 2 strukturiert ist, das für das Signalformat der p gemeinsamen Videosignalformate mit der höchsten Videosignalgüte bezeichnend ist.
  3. Videosystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Detektoreinheit in eine der Anordnungen aufgenommen ist, daß der Ausgang der Detektoreinheit mit einem Detektorsignalausgang dieser Anordnung gekoppelt ist, und daß die andere(n) Anordnung(en) einen (je einen) Detektorsignaleingang hat (haben), der über den Signalbus mit dem Detektorsignalausgang der einen Anordnung gekoppelt sein kann.
  4. Videosystem nach Anspruch 3, dadurch gekennzeichnet, daß diese eine Anordnung eine Videosignalerzeugungsanordnung ist.
  5. Videosystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Videosignalerzeugungsanordnung und die wenigstens eine Videosignalempfangsanordnung je einen zur Detektoreinheit gehörenden Detektor enthalten, der zum Erstellen der gemeinsamen p Videosignalformate und zum Erzeugen des Detektorsignals strukturiert ist, daß die Detektoren dazu mit je einem Eingang mit dem Steuersignalausgang der zugeordneten Anordnung gekoppelt ist, und einen Ausgang zum Erzeugen des für das gemeinsame Signalformat bezeichnenden Detektorsignals bei p = 1 und zum Erzeugen des für einem und demselben Videosignalformat der p gemeinsamen Videosignalformate bezeichnenden Detektorsignals bei p ≧ 2 enthält, daß die Videosignalerzeugungsanordnung zum Erzeugen eines Videosignals an ihrem Videosignalausgang in Beantwortung des Detektorsignals des zugeordneten Detektors entsprechend dem von diesem Detektor gewählten gemeinsamen Videosignalformat strukturiert ist, und daß die Videosignalempfangsanordnung zum Einstellen der Empfangsanordnung in Beantwortung des Detektorsignals des zugeordneten Detektors derart strukturiert ist, daß das an ihren Videosignaleingang gelegte Videosignal bearbeitet werden kann.
  6. Videosystem nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Steuersignalausgänge der Anordnungen je y Unterausgänge enthalten, während jeder der y Steuersignal-Unterausgänge einer Anordnung einem der y Videosignalformate entspricht, daß jeder der y Steuersignal-Unterausgänge einer Anordnung mit einem entsprechenden Unterausgang der y Steuersignal-Unterausgänge der anderen Anordnungen auf einer zugeordneten Signalleitung im Signalbus gekoppelt werden kann, und daß d er Steuersignalgenerator in einer Anordnung y Ausgänge enthält, wobei jeder der y Ausgänge mit einem zugeordneten Steuersignal-Unterausgang der Anordnung gekoppelt ist, daß der Steuersignalgenerator in der Videosignalerzeugungsanordnung zum Erzeugen des ersten Steuersignals an den den x Videosignalformaten entsprechenden x Ausgängen und/oder zum Erzeugen des zweiten Steuersignals an den y-x restlichen Ausgängen strukturiert ist, und daß der Steuersignalgenerator in der Videosignalerzeugungsanordnung zum Erzeugen des ersten Steuersignals an den den z Videosignalformaten entsprechenden z Ausgängen und/oder zum Erzeugen des zweiten Steuersignals an den y-z restlichen Ausgängen strukturiert ist.
  7. Videosystem nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Steuersignalgenerator in der Videosignalerzeugungsanordnung zum seriellen Erzeugen der x ersten Steuersignale für jedes der x Videosignalformate in einer spezifischen festen Reihenfolge für die y Videosignalformate und/oder zum seriellen Erzeugen der y-x zweiten Steuersignale für jedes der y-x restlichen Videosignalformate strukturiert ist, daß der Steuersignalgenerator in der Videosignalempfangsanordnung zum seriellen Erzeugen der z ersten Steuersignale für jedes der z Videosignalformate in derselben Reihenfolge für die y Videosignalformate und/oder zum seriellen Erzeugen der y-z zweiten Steuersignale für jedes der y-z restlichen Videosignalformate strukturiert ist, und daß ein Ausgang eines Steuersignalgenerators mit dem Steuersignalausgang der zugeordneten Anordnung gekoppelt ist.
  8. Videosystem nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die ersten Steuersignale Signale mit einem ersten Potential und die zweiten Steuersignale Signale mit einem zweiten Potential sind.
  9. Videosystem nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Signalbus das an sich bekannte SCART-Kabel ist, und daß die Steuersignalausgänge der Videosignalerzeugungsanordnung und der Videosignalempfangsanordnung(en) miteinander auf der Leitung mit der Nummer 10 im SCART-Kabel gekoppelt werden kann.
  10. Videosystem nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Signalbus das an sich bekannte SCART-Kabel ist, und daß die Steuersignalausgänge der Videosignalerzeugungsanordnung und der Videosignalempfangsanordnung(en) miteinander auf der Leitung mit der Nummer 12 im SCART-Kabel gekoppelt werden können.
  11. Videosignalerzeugungsanordnung nach der Definition in einem oder mehreren der vorangehenden Ansprüche, zur Verwendung im Videosystem nach einem oder mehreren der vorangehenden Ansprüche.
  12. Videosignalerzeugungsanordnung nach Anspruch 11, dadurch gekennzeichnet, daß die Videosignalerzeugungsanordnung die Detektoreinheit oder einen zur Detektoreinheit gehörenden Detektor, x (x ≧ 2) Videosignalquellen und steuerbare Schaltmittel enthält, daß Ausgänge der x Videosignalquellen mit zugeordneten x Eingängen der steuerbaren Schaltmittel gekoppelt sind, von denen ein Ausgang mit dem Videosignalausgang der Anordnung gekoppelt ist, daß der Ausgang des Detektors (der Detektoreinheit) mit einem Steuersignaleingang der steuerbaren Schaltmittel gekoppelt ist, und daß in Beantwortung des Detektorsignals des Detektors (der Detektoreinheit) an den Steuersignaleingang die Schaltmittel zum Koppeln der Videosignalquelle mit dem Videosignalausgang angeordnet sind, und die Quelle zum Erzeugen des Videosignals entsprechend dem vom Detektor (von der Detektoreinheit) erstellten Videosignalformat angeordnet ist.
  13. Videosignalerzeugungsanordnung nach Anspruch 11 oder 12 zur Verwendung in einem Videosystem nach Anspruch 7 und 8, dadurch gekennzeichnet, daß der Steuersignalgenerator einen zwischen einem ersten Punkt mit einem ersten Potential und dem Ausgang des Steuersignalgenerators angebrachten ersten steuerbaren Schalter enthält, daß zum Erzeugen eines ersten Steuersignals am Ausgang für eines der x Videosignalformate der Steuersignalgenerator zum Herstellen einer Verbindung zwischen dem ersten Punkt mit dem ersten Potential und dem Ausgang zum Schließen dieses steuerbaren Schalters strukturiert ist.
  14. Videosignalerzeugungsanordnung nach Anspruch 11, 12 oder 13 zur Verwendung in einem Videosystem nach Anspruch 7 und 8, dadurch gekennzeichnet, daß der Steuersignalgenerator einen zwischen dem Ausgang des Steuersignalgenerators und einem zweiten Punkt mit einem zweiten Potential angebrachten zweiten steuerbaren Schalter enthält, und daß zum Erzeugen eines zweiten Steuersignals am Ausgang für eines der y-x restlichen Videosignalformate der Steuersignalgenerator zum Herstellen einer Verbindung zwischen dem zweiten Punkt mit dem zweiten Potential und dem Ausgang durch das Schließen des zweiten steuerbaren Schalters strukturiert ist.
  15. Videosignalerzeugungsanordnung nach Anspruch 14, sofern vom Anspruch 11 oder 12 abhängig, dadurch gekennzeichnet, daß der Steuersignalgenerator ausßerdem eine zwischen einem ersten Punkt mit einem ersten Potential und dem Ausgang des Steuersignalgenerators angeordnete Impedanz enthält.
  16. Videosignalerzeugungsanordnung nach Anspruch 13, dadurch gekennzeichnet, daß der Steuersignalgenerator außerdem eine zwischen dem Ausgang des Steuersignalgenerators und einem zweiten Punkt mit einem zweiten Potential angebrachte Impedanz enthält.
  17. Videosignalerzeugungsanordnung nach einem der Ansprüche 11 bis 16, dadurch gekennzeichnet, daß die Videosignalerzeugungsanordnung den zur Detektoreinheit gehörenden Detektor enthält, und daß der Detektor zum Detektieren des in der (den) Videosignalempfangsanordnung(en) erzeugten zweiten Steuersignals für jedes der x Videosignalformate und zum Erstellen der p Videosignalformate der x Videosignalformate strukturiert ist, für die keine der anderen Anordnungen das zweite Steuersignal erzeugt haben.
  18. Videosignalerzeugungsanordnung nach Anspruch 11 zur Verwendung im Videosystem nach Anspruch 7, dadurch gekennzeichnet, daß der Steuersignalgenerator zum wiederkehrenden Erzeugen der x ersten und y-x zweiten Steuersignale strukturiert ist, wobei die Wiederholungen dieser Steuersignale bestimmte Zeitintervalle auseinanderliegen.
  19. Videosignalerzeugungsanordnung nach Anspruch 18, dadurch gekennzeichnet, daß der Steuersignalgenerator zum Erzeugen des zweiten Steuersignals in den Zeitintervallen strukturiert ist.
  20. Videosignalempfangsanordnung nach der Definition in einem der Ansprüche 1 bis 8 zur Verwendung im Videosystem nach einem der Ansprüche 1 bis 8.
  21. Videosignalempfangsanordnung nach Anspruch 20, dadurch gekennzeichnet, daß die Videosignalempfangsanordnung z (z ≧ 2) Videosignalverarbeitungseinheiten und steuerbare Schaltmittel enthält, daß der Videosignaleingang mit einem Eingang der steuerbaren Schaltmittel gekoppelt ist, daß die Schaltmittel mit z Ausgängen an je einen Eingang einer zugeordneten Videosignalbearbeitungseinheit gekoppelt sind, daß der Ausgang des Detektors (der Detektoreinheit) mit einem Steuersignaleingang der Schaltmittel gekoppelt ist, und daß die Schaltmittel zum Koppeln des Videosignaleingangs mit dem Eingang der Videosignalbearbeitungseinheit zum Bearbeiten des Videosignals entsprechend dem Videosignalformat angeordnet sind, daß der Detektor (die Detektoreinheit) in Beantwortung des dem Steuersignaleingang zugeführten Detektoreinheitsignals erzeugt hat.
  22. Videosignalempfangsanordnung nach Anspruch 21, dadurch gekennzeichnet, daß die Videosignalempfangsanordnung die Detektoreinheit oder den der Detektoreinheit zugeordneten Detektor enthält.
  23. Videosignalempfangsanordnung nach Anspruch 20, 21 oder 22, dadurch gekennzeichnet, daß der Steuersignalgenerator einen zwischen dem Ausgang des Steuersignalgenerators und einem Punkt mit einem zweiten Potential steuerbaren Schalter enthält, daß zum Erzeugen des zweiten Steuersignals am Ausgang für eines der y-z restlichen Videosignalformate der Steuersignalgenerator zum Herstellen einer Verbindung zwischen dem Punkt mit dem zweiten Potential und dem Ausgang durch das Schließen des steuerbaren Schalters strukturiert ist.
  24. Videosignalempfangsanordnung nach einem der Ansprüche 20, 21, 22 oder 23, dadurch gekennzeichnet, daß die oder eine Videosignalempfangsanordnung den zur Detektoreinheit gehörenden Detektor enthält, und daß der Detektor zum Detektieren des zweiten in der Videosignalerzeugungsanordnung oder in einer anderen Videosignalempfangsanordnung (wenn vorhanden) erzeugten Steuersignals für jedes der z Videosignalformate und zum Erstellen dieser p Videosignalformate aus den z Videosignalformaten strukturiert ist, wenn keine der anderen Anordnungen das zweite Steuersignal erzeugt haben.
  25. Videosignalempfangsanordnung nach Anspruch 20 zur Verwendung im Videosystem nach Anspruch 7, das eine Videosignalerzeugungsanordnung nach Anspruch 19 enthalten kann, dadurch gekennzeichnet, daß der Steuersignalgenerator zum Erzeugen eines zweiten Steuersignals in den Zeitintervallen strukturiert ist.
EP90203394A 1990-01-19 1990-12-18 Videosystem Expired - Lifetime EP0437882B1 (de)

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NL9000130 1990-01-19
NL9000130A NL9000130A (nl) 1990-01-19 1990-01-19 Videosysteem.

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JP (1) JP3152443B2 (de)
KR (1) KR100236505B1 (de)
AT (1) ATE121896T1 (de)
DE (1) DE69018960T2 (de)
ES (1) ES2075876T3 (de)
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JPH04212586A (ja) 1992-08-04
ES2075876T3 (es) 1995-10-16
FI910229A (fi) 1991-07-20
DE69018960D1 (de) 1995-06-01
DE69018960T2 (de) 1995-12-07
EP0437882A1 (de) 1991-07-24
ATE121896T1 (de) 1995-05-15
KR910015170A (ko) 1991-08-31
FI100290B (fi) 1997-10-31
US5255097A (en) 1993-10-19
FI910229A0 (fi) 1991-01-16
NL9000130A (nl) 1990-05-01

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